NPA Codes in USA starting with 5
| NPA | Country | Time Difference (From GMT) | State | State Abbrv. | Service Date | Comments |
| 500 | USA | | Personal Communication Services | | | |
| 501 | USA | -6 | Arkansas | AR | | |
| 502 | USA | -5 | Kentucky | KY | | |
| 503 | USA | -8 | Oregon | OR | | |
| 504 | USA | -6 | Louisiana | LA | | |
| 505 | USA | -7 | New Mexico | NM | | |
| 507 | USA | -6 | Minnesota | MN | | |
| 508 | USA | -5 | Massachusetts | MA | | |
| 509 | USA | -8 | Washington | WA | | |
| 510 | USA | -8 | California | CA | 02 Sep 1991 | |
| 512 | USA | -6 to -7 | Texas | TX | | |
| 513 | USA | -5 | Ohio | OH | | |
| 515 | USA | -6 | Iowa | IA | | |
| 516 | USA | -5 | New York | NY | | |
| 517 | USA | -5 | Michigan | MI | | |
| 518 | USA | -5 | New York | NY | | |
| 520 | USA | -7 | Arizona | AZ | 19 Mar 1995 | |
| 530 | USA | -8 | California | CA | 01 Nov 1997 | |
| 531 | USA | -6 | Nebraska | NE | 26 Jun 2010 | |
| 534 | USA | -6 | Wisconsin | WI | 17 Oct 2009 | |
| 539 | USA | -6 | Oklahoma | OK | 07 Aug 2010 | |
| 540 | USA | -5 | Virginia | VA | 15 Jul 1995 | |
| 541 | USA | -8 | Oregon | OR | 05 Nov 1995 | |
| 551 | USA | -5 | New Jersey | NJ | 01 Jul 2001 | |
| 555 | USA | | Not Available | | | Used by Hollywood ... |
| 557 | USA | -5 | Missouri | MO | | Suspended |
| 559 | USA | -8 | California | CA | 14 Nov 1998 | |
| 561 | USA | -5 to -6 | Florida | FL | 13 May 1996 | |
| 562 | USA | -8 | California | CA | 25 Jan 1997 | |
| 563 | USA | -6 | Iowa | IA | 25 Mar 2001 | |
| 564 | USA | -8 | Washington | WA | 28 Aug 2017 | |
| 567 | USA | -5 | Ohio | OH | 01 Dec 2001 | |
| 570 | USA | -5 | Pennsylvania | PA | 05 Dec 1998 | |
| 571 | USA | -5 | Virginia | VA | 01 Mar 2000 | |
| 573 | USA | -5 | Missouri | MO | 07 Jan 1996 | |
| 574 | USA | -5 | Indiana | IN | 15 Jan 2002 | |
| 575 | USA | -7 | New Mexico | NM | 07 Oct 2007 | |
| 580 | USA | -6 | Oklahoma | OK | 01 Nov 1997 | |
| 585 | USA | -5 | New York | NY | 15 Nov 2001 | |
| 586 | USA | -5 | Michigan | MI | 22 Sep 2001 | |
See World Zone 1 for explanation of "NPA"
Where shown:
| Time Diff. |
is with respect to GMT (UCT) |
Suspended
Pending
Proposed |
indicate the code is not in use: the "Service Date" has been delayed or not set |
| Service Date |
is the date code becomes (or became) effective. If no date is shown, the code was introduced before 1995 |